EP1877684B1 - Apparatus for indicating power transmission belt dynamics - Google Patents

Apparatus for indicating power transmission belt dynamics Download PDF

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Publication number
EP1877684B1
EP1877684B1 EP06750210A EP06750210A EP1877684B1 EP 1877684 B1 EP1877684 B1 EP 1877684B1 EP 06750210 A EP06750210 A EP 06750210A EP 06750210 A EP06750210 A EP 06750210A EP 1877684 B1 EP1877684 B1 EP 1877684B1
Authority
EP
European Patent Office
Prior art keywords
sensor
support housing
pivot arm
arm
belt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06750210A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1877684A4 (en
EP1877684A2 (en
Inventor
Jeffrey A. Pendergrass
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dayco Products LLC
Original Assignee
Dayco Products LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dayco Products LLC filed Critical Dayco Products LLC
Publication of EP1877684A2 publication Critical patent/EP1877684A2/en
Publication of EP1877684A4 publication Critical patent/EP1877684A4/en
Application granted granted Critical
Publication of EP1877684B1 publication Critical patent/EP1877684B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/22—Belt, rope, or chain shifters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/081—Torsion springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0846—Means for varying tension of belts, ropes, or chains comprising a mechanical stopper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0861—Means for varying tension of belts, ropes, or chains comprising means for sensing tensioner position

Definitions

  • the present application relates generally to belt tensioners and more particularly to a belt tensioner including a sensor for use in indicating power transmission belt dynamics and a method of indicating tension according to the preamble of claims 1, 6 and as it is disclosed in EP 1158287A .
  • a tensioner is frequently utilized in a belt system to tension an endless belt that transmits power to accessories in an automobile engine.
  • Tensioners may use a spring, such as a flat wire or round wire spring to bias a pivot arm toward the belt.
  • the belts tend to wear and need to be replaced. Frequently, belt wear is detected by visual inspection.
  • belts are replaced using only recommended guidelines such as belt replacement every 15,000 miles of vehicle travel or yearly belt replacement.
  • an apparatus for indicating an automotive power transmission belt dynamic having the features of claim 1.
  • a method of indicating tension applied to an automotive power transmission belt having the features of claim 6.
  • a belt tensioner 10 includes a support housing 12 and a pivot arm 14 rotatably mounted to the support housing to form a spring cavity 11 therebetween.
  • a spring 13 such as a round wire or flat wire spring.
  • the spring 13 applies a force to the pivot arm 14 during use to bias the pivot arm toward an unloaded position.
  • the pivot arm 14 carries a pulley 20, such as a front or backside idler pulley, that can rotate relative to the pivot arm.
  • the pulley 20 has a belt-engaging surface 22 for engaging a belt 116, such as an automotive transmission belt ( Fig. 2 ).
  • the belt tensioner 10 includes a sensor 24 that is responsive to an input associated with a position of the pivot arm 14. Upon receipt of the input, the sensor 24 provides an indication.
  • the sensor 24, by responding to input associated with position of the pivot arm 14, can provide detection of excessive belt 116 dynamics, which can be an indication of, for example, excessive belt stretch, incorrect belt sizing, etc.
  • Such belt problems may be a result of or lead to other vehicle problems, such as misfire, failing or locked accessory components, broken belts, fuel feed problems during vehicle accelerations and/or engine start ups, etc.
  • sensor 24 may provide an indication of desirable belt conditions, e.g., to indicate operation of the belt 116 at extremes of any desirable range of belt tensions.
  • sensor 24 is a switch 25 that includes a first toggle cam 26, a second toggle cam 28 and conductors 50 for electrically connecting the switch 25 to, for example, a controller (see Fig. 8 ).
  • First toggle cam 26 and second toggle cam 28 are each positioned at a distal end of a respective flexible, elastic finger 30 and 32.
  • the fingers 30 and 32 are supported in a cantilevered relationship by a switch body 34 that is mounted to an outer surface 36 of the support housing 12.
  • second toggle cam 28 is positioned a greater distance from the support housing 12 than first toggle cam 26. This can allow for, in the illustrated embodiment, actuation of the switch 25 at two, angularly spaced apart limit positions P 1 and P 2 (see Figs. 4 and 6 , respectively) of the pivot arm 14 relative to the support housing 12 using appropriately sized and positioned actuation members 38 and 40.
  • Actuation member 38 is shorter than actuator member 40 and each actuation member includes a narrow stem portion 42, 44 that extends integrally from an outer surface 49 of the pivot arm 14 to an enlarged distal end 45 and 47.
  • Distal end 45 of actuation member 38 is sized to contact the first toggle cam 26 and distal end 47 of actuation member 40 is sized to contact the second toggle cam 28, without either of the actuation members 38, 40 making contact with the other of the toggle cams.
  • the enlarged distal ends 45 and 47 contact the first and second toggle cams 26 and 28, respectively.
  • This contact can deflect the associated fingers 30, 32, which, in turn, can depress a respective switch member 52 (see Fig. 5 showing only one of the switch members 52).
  • the switch 25 and actuation members 38 and 40 may be connected to the belt tensioner 10 by any suitable method including by mechanical fasteners and/or by welding.
  • pivot arm 14 is shown at P 1 with cooperating stops 56 and 58 inhibiting further rotation of the pivot arm relative to the support housing 12 in the direction of arrow 16.
  • actuation member 38 is in contact with first toggle cam 26 ( Fig. 5 ), deflecting finger 30, e.g. to close switch 25.
  • Pivot arm 14 in this position may indicate, for example, a broken belt, use of a belt of improper length (e.g., too long), belt slippage, belt jumping, improper belt positioning, etc.
  • the belt applies a force to the pivot arm 14 causing the pivot arm to rotate in a direction opposite bias direction 16, i.e., in the direction of arrow 62.
  • Rotation of the pivot arm 14 in the direction of arrow 62 causes the actuation member 38 to disengage the first toggle cam 26, which allows finger 30 to recover at least substantially to its initial position (see Fig. 3 ).
  • the pivot arm 14 is located between P 1 and P 2 as shown in Figs. 2 and 3 .
  • the switch 25 is open. Spring biasing of the pivot arm and tensioning an automotive transmission belt is described in detail in U.S. Patent No. 6,206,797 , the details of which are incorporated by reference as if fully set forth herein.
  • pivot arm 14 is shown at P 2 with pivot arm 14 rotated an angle ⁇ from P 1 .
  • the range of ⁇ depends on the desired use of tensioner 10.
  • Cooperating stops 56 and 64 inhibit further rotation of the pivot arm beyond ⁇ relative to the support housing 12 in the direction of arrow 62.
  • actuation member 40 contacts the second toggle cam 28 ( Fig. 7 ) and deflects finger 32 which, e.g., closes switch 25 to provide a positive indication.
  • Pivot arm 14 in this position may indicate, for example, the presence of high transient torsional loadings or tension reversal in the drive due to torsional events at the crankshaft or at an accessory pulley, engine misfire, failing or locked components, fuel feed problems, use of a belt of improper length (e.g., too short), excessive hub loads, etc.
  • P 1 and P 2 may be located at other positions (e.g., other than the stop positions illustrated by Figs. 4-7 ) to indicate operation of the belt 116 at the extremes of a desired range of belt tensions, the signal from which might be used to control, for example, the engagement of a fan clutch, air conditioner and/or throttle control.
  • a system 100 for use in alerting a user (e.g., the driver of an automobile) of excessive travel of pivot arm 14 includes the belt tensioner 10 with the sensor 24.
  • Belt tensioner 10 is mounted to an engine (not shown) for use in tensioning belt 116.
  • Sensor 24 is connected to a controller 104 capable of receiving indication from the sensor.
  • Controller 104 in response to receipt of indication from the sensor 24, controls a signaling device 106 (e.g., a light, a buzzer, a display, such as a monitor or LCD, etc.) for signaling the user.
  • the controller 104 may be configured to recognize opening (and/or closing) of an electrical circuit, such as in the embodiment described above with respect to Figs.
  • sensor 24 is in the form of switch 25.
  • the sensor 24 can be connected directly to the signaling device 106.
  • the system 100 may provide a warning to a user, e.g. prior to complete belt failure, that is not dependent on, for example, visual inspection or recommended guidelines.
  • a switch 25 with multiple toggle cams has been primarily described above, other sensors can be used, such as multiple switches or one switch with one or more toggle cams, Hall effect sensors, laser position sensors, potentiometers, or quantized devices such as trigger wheels with inductive pickups and proximity switches.
  • the sensor 24 can be used to activate features such as magneto-rheological (MR) and electro-rheological (ER) devices, valves and servos, and/or to provide feedback to the belt tensioner for self adjustment, for example using an electro-mechanical device capable of adjusting pivot arm tension and/or position.
  • MR magneto-rheological
  • ER electro-rheological
  • a controller may control the adjustment of the pivot arm tension and/or position by signaling an electro-mechanical device connected to the pivot arm.
  • the sensor may not be mounted to the support housing and may instead be mounted directly to, for example, a stationary component of the engine, such as the engine block.
  • the sensor may provide relative (e.g. relative to the support housing or engine block) or absolute position of the pivot arm 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP06750210A 2005-04-21 2006-04-13 Apparatus for indicating power transmission belt dynamics Active EP1877684B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/110,672 US7771302B2 (en) 2005-04-21 2005-04-21 Apparatus for indicating power transmission belt dynamics
PCT/US2006/014117 WO2006115840A2 (en) 2005-04-21 2006-04-13 Apparatus for indicating power transmission belt dynamics

Publications (3)

Publication Number Publication Date
EP1877684A2 EP1877684A2 (en) 2008-01-16
EP1877684A4 EP1877684A4 (en) 2009-04-08
EP1877684B1 true EP1877684B1 (en) 2010-08-18

Family

ID=37187654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06750210A Active EP1877684B1 (en) 2005-04-21 2006-04-13 Apparatus for indicating power transmission belt dynamics

Country Status (12)

Country Link
US (1) US7771302B2 (ja)
EP (1) EP1877684B1 (ja)
JP (1) JP4971308B2 (ja)
KR (1) KR101217299B1 (ja)
CN (1) CN101189450B (ja)
AU (1) AU2006240253B2 (ja)
BR (1) BRPI0610538B1 (ja)
CA (1) CA2605627C (ja)
DE (1) DE602006016262D1 (ja)
ES (1) ES2350747T3 (ja)
MX (1) MX2007012871A (ja)
WO (1) WO2006115840A2 (ja)

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WO2013033822A1 (en) * 2011-09-05 2013-03-14 Litens Automotive Partnership Intelligent belt drive system and method
WO2013159181A1 (en) * 2012-04-28 2013-10-31 Litens Automotive Partnership Adjustable tensioner
GB2524023B (en) 2014-03-11 2017-10-18 Ford Global Tech Llc Belt slip monitor
CN106246342B (zh) * 2015-06-12 2019-11-19 福特环球技术公司 监测内燃发动机牵引机构驱动器的方法和内燃发动机
IT201600130235A1 (it) * 2016-12-22 2018-06-22 Dayco Europe Srl Tenditore sensorizzato
DE102017110192B3 (de) * 2017-05-11 2018-10-31 Schaeffler Technologies AG & Co. KG Verfahren zur Erkennung von Riemenschlupf
CN107327547A (zh) * 2017-07-19 2017-11-07 江苏丰东热技术有限公司 一种链条张紧控制机构以及链条张紧控制方法
DE102017123095A1 (de) 2017-10-05 2019-04-11 Schaeffler Technologies AG & Co. KG Messanordnung und Verfahren zur Ermittlung der Ausdehnung eines Antriebriemens
USD855079S1 (en) * 2017-11-10 2019-07-30 Zeta-Sassi Srl Tension device
KR102552020B1 (ko) * 2018-10-19 2023-07-05 현대자동차 주식회사 하이브리드 차량용 텐셔너
DE102020128355A1 (de) * 2020-05-26 2021-12-02 Aktiebolaget Skf Riemenspannungsüberwachungsvorrichtung
EP4001695A1 (de) * 2020-11-20 2022-05-25 Manuel Lindner Automatische einstellung und überwachung eines riemenantriebs
JP2023059699A (ja) * 2021-10-15 2023-04-27 セイコーエプソン株式会社 ロボットおよび調整方法

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Also Published As

Publication number Publication date
MX2007012871A (es) 2008-01-11
CA2605627A1 (en) 2006-11-02
WO2006115840A3 (en) 2007-12-27
AU2006240253B2 (en) 2012-02-02
US7771302B2 (en) 2010-08-10
CN101189450B (zh) 2010-08-11
BRPI0610538A2 (pt) 2010-06-29
KR20070120186A (ko) 2007-12-21
EP1877684A4 (en) 2009-04-08
JP4971308B2 (ja) 2012-07-11
ES2350747T3 (es) 2011-01-26
EP1877684A2 (en) 2008-01-16
BRPI0610538B1 (pt) 2019-01-22
JP2008537084A (ja) 2008-09-11
KR101217299B1 (ko) 2012-12-31
DE602006016262D1 (de) 2010-09-30
AU2006240253A1 (en) 2006-11-02
WO2006115840A2 (en) 2006-11-02
CN101189450A (zh) 2008-05-28
US20060240922A1 (en) 2006-10-26
CA2605627C (en) 2013-03-19

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